<template>
    <label
        class="zx-checkbox-button"
        :class="[
            size ? 'zx-checkbox-button--' + size : '',
            { 'is-disabled': isDisabled },
            { 'is-checked': isChecked },
            { 'is-focus': focus },
        ]"
        role="checkbox"
        :aria-checked="isChecked"
        :aria-disabled="isDisabled"
    >
        <input
            v-if="trueLabel || falseLabel"
            v-model="model"
            class="zx-checkbox-button__original"
            type="checkbox"
            :name="name"
            :disabled="isDisabled"
            :true-value="trueLabel"
            :false-value="falseLabel"
            @change="handleChange"
            @focus="focus = true"
            @blur="focus = false"
        >
        <input
            v-else
            v-model="model"
            class="zx-checkbox-button__original"
            type="checkbox"
            :name="name"
            :disabled="isDisabled"
            :value="label"
            @change="handleChange"
            @focus="focus = true"
            @blur="focus = false"
        >

        <span
            v-if="$slots.default || label"
            class="zx-checkbox-button__inner"
            :style="isChecked ? activeStyle : null"
        >
            <slot>{{ label }}</slot>
        </span>

    </label>
</template>
<script>
import Emitter from '@src/mixins/emitter';

export default {
    name: 'ZxCheckboxButton',

    mixins: [Emitter],

    inject: {
        zxForm: {
            default: '',
        },
        zxFormItem: {
            default: '',
        },
    },

    props: {
        value: {},
        label: {},
        disabled: Boolean,
        checked: Boolean,
        name: String,
        trueLabel: [String, Number],
        falseLabel: [String, Number],
    },

    data() {
        return {
            selfModel: false,
            focus: false,
            isLimitExceeded: false,
        };
    },
    computed: {
        model: {
            get() {
                return this._checkboxGroup
                    ? this.store : this.value !== undefined
                        ? this.value : this.selfModel;
            },

            set(val) {
                if (this._checkboxGroup) {
                    this.isLimitExceeded = false;
                    (this._checkboxGroup.min !== undefined &&
                        val.length < this._checkboxGroup.min &&
                        (this.isLimitExceeded = true));

                    (this._checkboxGroup.max !== undefined &&
                        val.length > this._checkboxGroup.max &&
                        (this.isLimitExceeded = true));

                    this.isLimitExceeded === false &&
                        this.dispatch('ZxCheckboxGroup', 'input', [val]);
                } else if (this.value !== undefined) {
                    this.$emit('input', val);
                } else {
                    this.selfModel = val;
                }
            },
        },

        isChecked() {
            if ({}.toString.call(this.model) === '[object Boolean]') {
                return this.model;
            } else if (Array.isArray(this.model)) {
                return this.model.indexOf(this.label) > -1;
            } else if (this.model !== null && this.model !== undefined) {
                return this.model === this.trueLabel;
            }
            // return null;
        },

        _checkboxGroup() {
            let parent = this.$parent;
            while (parent) {
                if (parent.$options.componentName !== 'ZxCheckboxGroup') {
                    parent = parent.$parent;
                } else {
                    return parent;
                }
            }
            return false;
        },

        store() {
            return this._checkboxGroup ? this._checkboxGroup.value : this.value;
        },

        activeStyle() {
            return {
                backgroundColor: this._checkboxGroup.fill || '',
                borderColor: this._checkboxGroup.fill || '',
                color: this._checkboxGroup.textColor || '',
                'box-shadow': '-1px 0 0 0 ' + this._checkboxGroup.fill,

            };
        },

        _zxFormItemSize() {
            return (this.zxFormItem || {}).zxFormItemSize;
        },

        size() {
            return this._checkboxGroup.checkboxGroupSize || this._zxFormItemSize || (this.$ELEMENT || {}).size;
        },

        /* used to make the isDisabled judgment under max/min props */
        isLimitDisabled() {
            const { max, min } = this._checkboxGroup;
            return !!(max || min) &&
                (this.model.length >= max && !this.isChecked) ||
                (this.model.length <= min && this.isChecked);
        },

        isDisabled() {
            return this._checkboxGroup
                ? this._checkboxGroup.disabled || this.disabled || (this.zxForm || {}).disabled || this.isLimitDisabled
                : this.disabled || (this.zxForm || {}).disabled;
        },
    },

    created() {
        this.checked && this.addToStore();
    },
    methods: {
        addToStore() {
            if (
                Array.isArray(this.model) &&
                this.model.indexOf(this.label) === -1
            ) {
                this.model.push(this.label);
            } else {
                this.model = this.trueLabel || true;
            }
        },
        handleChange(ev) {
            if (this.isLimitExceeded) return;
            let value;
            if (ev.target.checked) {
                value = this.trueLabel === undefined ? true : this.trueLabel;
            } else {
                value = this.falseLabel === undefined ? false : this.falseLabel;
            }
            this.$emit('change', value, ev);
            this.$nextTick(() => {
                if (this._checkboxGroup) {
                    this.dispatch('ZxCheckboxGroup', 'change', [this._checkboxGroup.value]);
                }
            });
        },
    },
};
</script>
